# Copyright (C) 2010 Google Inc. All rights reserved.
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from google.appengine.ext import webapp, db
from google.appengine.ext.webapp import template

from handlers.updatebase import UpdateBase
from model.attachment import Attachment
from model.queues import Queue


class ReleasePatch(UpdateBase):
    def get(self):
        self.response.out.write(template.render("templates/releasepatch.html", None))

    def post(self):
        queue_name = self.request.get("queue_name")
        # FIXME: This queue lookup should be shared between handlers.
        queue = Queue.queue_with_name(queue_name)
        if not queue:
            self.error(404)
            return

        attachment_id = self._int_from_request("attachment_id")
        attachment = Attachment(attachment_id)
        last_status = attachment.status_for_queue(queue)

        # Ideally we should use a transaction for the calls to
        # WorkItems and ActiveWorkItems.

        # Only remove it from the queue if the last message is not a retry request.
        # Allow removing it from the queue even if there is no last_status for easier testing.
        if not last_status or not last_status.is_retry_request():
            queue.work_items().remove_work_item(attachment_id)

        # Always release the lock on the item.
        queue.active_work_items().expire_item(attachment_id)